I don't think we can go around making suggestions as to what next-gen games will need. At this stage, we have very little information as to what they will require. I personally feel games will become more GPU intensive, and require larger amounts of VRAM, but we can all make suggestions.

If I were you, I would keep your current rig and buy a HD7970 or GTX770, and if it does turn out that you will need more CPU power, you can upgrade then. Chances are (in my opinion) you should be fine with your current processor for at least a year.